Perforated liner washer



Nov. 24, 1936. R. c. BAKER -PERFORATED LINER WASHER Filed Jan. 12, 1955 NVENTOR 0K 6 A m c.. N am w R Patented Nom 24, 1936 UNITED STATES PATENT OFFICE PEBFORATED LINER WASHER Reuben C. Baker, Coalinga, Calif., assigner to Baker. Oil Tools, Inc., Huntington Park, Calif., a corporationA of California Application January 12. 1935., seria; No. 1,505 1 claim. (ol. 16a-2o) This invention relates to deep oil well equipment and particularly pertains to an apparatus for washing perforated liners in deep wells.

It is the principal object of my present inventool is fitted with a flexible sleeve which is expanded to blank on' the perforated liner by the Apressure of the washing uid conveyed through the tool so that the uid will effect a washing action exteriorly of the Kliner over the area of the liner so blanked olf. When the uid pressure is dropped the sleeve contracts and the entire tool may be removed from the hole.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawing in which:

Fig. 1 is a view in centrally longitudinal section through a tool embodying the preferred form of my invention and illustrating the manner of its use.

Fig. 2 is a transverse sectional view taken on line 2,-2 of Fig. 1.

Referring more particularly to the accom- '30 panying drawing, I0 indicates a liner washing device principally for use in washing the exterior of a perforated liner in awell bore. This' washing device may be run in the hole on tubing and used to wash the liner and thenpulled from the hole. In use, the device may be quickly shifted to any point along the liner so that the desired washing effect may be obtained.

From the drawing itwill be-noted that the device comprises a central tube II having a removable upper head I2 adjacent to its upper end and a removable lower head Il at its lowermost end.

It will be noticed that the upperhead I2 is bored as at I5 to receive the tube II. t

To clamp the head I2 on the tube, the latter is fitted with a iixed ring I6 which fits a counterbore II above the bore I5 in the tube and which is adjacent the annular shoulder between the counterbore I'I and the bore I5. Packing I8 is interposed between the adjacent faces of the ring I6 and the shoulder mentioned.

The upper portion ofthe counterbore I1 is threaded to receive a. gland member I9 which is bored to receive the tube II. 4When the gland member is positioned the ring I8 is clamped between the gland I9 and the shoulder and thereby the parts are held relatively fixed.

It should be stated that the endof the tube above the upper head is threaded in order that .it may be coupled to running in tubing. I 5

The lower head Il is formed. with a. central bore extending downwardly from its upper end and threaded to receive the threaded lower end of the central tube II and so connect the two parts. .10

A nozzle 20 is fitted to the lower head I4 in a concentric position. This nozzle 20 is cylindrical in form with a bore having a Venturi tube effect. Centrally between its ends the nozzle is fitted with an exterior ilange 2| which is clamped 15 against an annular shoulder 22 in the lowerhead l I4 by a gland number 23. Packing 24 is provided to prevent leakage. I It will be noticed that the nozzle 20 extend from the interior of the tube II through the 20 lower' head I4 so as to discharge fluid conveyed down the tube at the lower end of the device.

Surrounding the central tube II is a flexible packing sleeve 25 the inside diameter of which is considerably larger than theexterior diameter 25 of the tube Il. This packing sleeve is fitted at its opposite ends with connector rings 26 which inV turn are threaded to .the upper and lower heads I2 and I4. It is intended that the sleeve be expanded by suitable iiuid pressure into tight contact with the inner surface of a perforated liner and when the pressure is relieved that the liner contract due to its inherent resiliency to enable the entire device to be removed from the 35 hole.

To accomplish this, the tube I'I is formed with ports 21 along its` length between the heads I2 and I4. Midway between the heads I2 and Il the interior ofthe tube is closed to the passage 40 of fluid by an imperforated baille 28 so that fluid pumped into the upper end of the tube must pass into the sleeve expanding chamber 29 between the tubev and sleeve before it can reach the open nozzle 20,' The relative cross sectional area of 45 the nozzle bore and the tube I I is such that sumcient pressure will be built up in the expanding chamber 29 to expand the packing sleeve 25 into rm contact with the interior surface of the liner. When the pump pressure is relieved the sleeve 25 50 will collapse and the device may be pulled from the hole. A

yIn voperation the device is constructed substantially as illustrated and the tube Il is connected to the lower end of a string of tubing and lowered 55 into theh01e., When it aligns with thasection of liner it is desired to wash, uid under high pressure is pumped down through the running in tubing into the tube Il. This fluid will pass into the expanding chamber 29, expand the packing sleeve and then discharge through the nozzle. The iluid so discharged will pass out through the liner and upwardly between that section of the liner blanked off by the sleeve and bore and will wash that area. By shifting the washing Vdevice any length of the liner may be washed. Also the length of the packing-sleeve may be varied to effect washing of a desired length of a perforated liner in one operation.

After washing has been effected the pumppressure is relieved and the sleeve will contract so that the device may be pulled from the hole.

From the foregoing it is obvious that I have provided a very simple and eflicient tool which may be employed to expeditiously Wash perforated liners in deep well bores.

While I have shown the preferred form of my apparatus it is to be understood that various changes therein may be made by those skilled in the art without departing from the invention as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

An apparatus of the character described comprising ar central iiuid conducting tube, an upper head secured thereto, a lower head secured thereto, a nozzle in the lower head communicating with saidtube, a cylindrical packing sleeve secured at its ends to said heads and arranged exteriorly about said tube, said tube having portsl formed through its wall along its length between said heads, an imperforate transverse partition in said tube arranged at a point substantially centrally between said heads whereby fluid delivered downwardly through the tube will pasjs outwardly through said ports above said partition into the space between said tube and said packing sleeve and thenceback into the tube through the ports in said tube between the partition and the lower head and then discharge through the nozzle, said nozzle having a uid'passageway considerably less in cross-sectional area than that of the tube so that the fluid between the tube and the packing sleeve will expand the latter as it seeks to discharge back into the tube and through the nozzle.

REUBEN C. BAKER. 

